Posture pillow



FIG. 1 is a perspective view from above of a posture pillow showing my new design;

FIG. 2 is a top plan view of FIG. 1;

FIG. 3 is a bottom plan view of FIG. 1;

FIG. 4 is a side plan view of FIG. 1; and,

FIG. 5 is an end plan view of FIG. 1; 

CLAIM An ornamental design for a posture pillow, as shown and described. 